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DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for DI-1257
2UZ-FE)
DIDX2-01
DTC P2757 Torque Converter Clutch Pressure Control Solenoid
Performance(Shift Solenoid Valve SLU)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, Air-
flow meter, turbine (input) speed sensor, output speed sensor
and crankshaft position sensor to monitor the engagement
condition of the lock-up clutch.
Then the ECM compares the engagement condition of the
lock-up clutch with the lock-up schedule in the ECM memory
to detect a mechanical problems of the shift solenoid valve
D14175 SLU, valve body and torque converter clutch.
Lock-up
Operation
Pressure
Current Flow to Solenoid
G23415 D14176
DTC No. DTC Detection Condition Trouble Area
S Shift solenoid valve SLU remains open or closed
Lock-up does not occur when driving in the lock-up range
S Valve body is blocked
(normal driving at 80 km/h [50 mph]), or lock-up remains ON
P2757 S Torque converter clutch
in the lock-up OFF range.
S Automatic transmission (clutch, brake or gear, etc.)
(2-trip detection logic)
S Line pressure is too low
DI-1258 DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for
2UZ-FE)
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on the turbine (input) speed sensor NT, output
speed sensor SP2, engine rpm, engine load, engine temperature, vehicle speed, transmission temperature,
and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine
rpm (NE) to the input turbine rpm (NT). The ECM calculates the actual transmission gear by comparing input
turbine rpm (NT) to output shaft rpm (SP2). When conditions are appropriate, the ECM requests "lock-up"
by applying control voltage to the shift solenoid SLU. When the SLU is turned on, it applies pressure to the
lock-up relay valve and locks the torque converter clutch.
If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not re-
quested, the ECM interprets this as a fault in the shift solenoid valve SLU or lock-up system performance.
The ECM will turn on the MIL and store the DTC.
Example:
When any of the following is met, the system judges it as a malfunction.
(a) There is a difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock-up.
(Engine speed is at least 70 rpm greater than input turbine speed.)
(b) There is no difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock-up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
MONITOR STRATEGY
Shift solenoid valve SLU/OFF malfunction
Related DTCs
R l t d DTC P2757
Shift solenoid valve SLU/ON malfunction
Main Shift solenoid valve SLU
Required sensors/Components Valve body, Vehicle speed sensor, Throttle position sensor, Speed sensor
Sub
(NT), Speed sensor (NO)
Frequency of operation Continuous
OFF malfunction (A) 2 sec.
Duration OFF malfunction (B) 0.4 sec.
ON malfunction 1.8 sec.
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
All:
Turbine speed sensor circuit Not circuit malfunction
Output speed sensor circuit Not circuit malfunction
Shift solenoid valve S1 circuit Not circuit malfunction
Shift solenoid valve S2 circuit Not circuit malfunction
Shift solenoid valve SR circuit Not circuit malfunction
Torque converter clutch pressure control
Not circuit malfunction
solenoid circuit
KCS sensor circuit Not circuit malfunction
ETCS (Electric throttle control system) Not system down
Transmission range "D"
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for DI-1259
2UZ-FE)
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